A backlink refers to a link and is created when a website links to another website.
All search engines like Google see backlinks as a ranking factor or signal.
Because when a site links to another site or links to another site, search engine bots think that the linked site or its content is high quality and relevant.
Building high-quality backlinks on a website increases the chances of improving that site's ranking position and SEO.
I am just giving you points or subjects on how to build or build backlinks instead of detailed discussion.
How to create backlinks
Guest blogging or guest blogging.
Directory submission.
Quora, Reddit and other forums and question answer sites link to or share content with various questions and answers. Create pages and profiles on social media sites and share blog site content.
Tumenting other blog sites similar to your website topic or niche. Linking to other articles within your own blog post. And exchange links with the sites of your known acquaintances or friends.
All the ways that I have provided here to create backlinks every blogger can create backlinks for his website or blog site for free from there.